2d/3d switchable image display device

ABSTRACT

A two-dimensional (2D)/three-dimensional (3D) switchable image display device is provided. The 2D/3D switchable image display device forms gradation of an image in a light modulation panel, provides color to light beams that penetrate a plurality of electro-wetting prisms arranged in correspondence to the plurality of pixels of the image, and adjusts the direction of the light beam such that the light beams of the pixels of the image are directed towards at least two different view zones in a 3D mode and such that the light beams maintain their paths in a 2D mode.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No.10-2010-0010614, filed on Feb. 4, 2010, in the Korean IntellectualProperty Office, the entire disclosure of which is incorporated hereinby reference for all purposes.

BACKGROUND

1. Field

The following description relates to a stereoscopic image displaydevice, and more particularly, to a two-dimensional/three-dimensional(2D/3D) switchable image display device.

2. Description of the Related Art

Recently, as the flat panel display market has become saturated, theflat panel display industry is seeking new markets. Thus, stereoscopicimage display devices have attracted attention as a next-generationapplication for the flat panel display industry. For example, movietheaters and flat panel display-based TVs, generally use image displaydevices in combination with 3D eyeglasses. However, the use ofeyeglasses can be irritating while at the same time not providing a highquality 3D image. Thus, image display devices that improve 3D imagequality and that do not use eyeglasses are under consideration anddevelopment.

In the image display devices not using glasses, to be compatible withthe existing panel and contents it is necessary that the image displaydevice be able to switch between two-dimensional (2D) andthree-dimensional (3D) images.

SUMMARY

In one general aspect, there is provided atwo-dimensional/three-dimensional (2D/3D) switchable image displaydevice comprising a backlight unit for emitting light, a lightmodulation panel for modulating the light emitted from the backlightunit based on image information and for forming image gradation, anelectro-wetting prism array comprising a plurality of electro-wettingprisms that are arranged in correspondence to a plurality of pixels ofthe image, for providing color to light beams that penetrate theplurality of electro-wetting prisms, and for adjusting the direction ofthe light beams, and a control unit for controlling the electro-wettingprism array such that the light beams of the plurality of pixels of theimage are directed towards at least two different view zones in a 3Dmode, and such that the light beams of the plurality of pixels of theimage maintain the paths of the light beams in a 2D mode.

The electro-wetting prism may comprise a first medium having color, atransparent second medium separate from the first medium, a housing forhousing the first medium and the second medium, and comprising a lightincidence plane, a light output plane facing the light incidence plane,and a plurality of side walls formed between the light incidence planeand the light output plane, and an electrode structure for adjusting anangle of an interface between the first medium and the second medium.

The control unit may control the electro-wetting prism array such thatthe interface between the first medium and the second medium is inclinedto the light incidence plane in a 3D mode, and such that the interfacebetween the first medium and the second medium is approximately parallelto the light incidence plane in a 2D mode.

The electrode structure may comprise first and second electrodes thatare formed in first and second side walls, respectively, and which faceeach other, and first and second insulating layers that cover the firstand second electrodes, respectively, and which each have a hydrophobicsurface.

The first medium may be an oily solution containing colored dyes and thesecond medium may be an aqueous solution.

The first medium may be an aqueous solution containing colored pigmentsand the second medium may be an oily solution.

The electro-wetting prism array may comprise a red electro-wetting prismthat has a red first medium, a green electro-wetting prism that has agreen first medium, and a blue electro-wetting prism that has a bluefirst medium.

The electro-wetting prism array may further comprise a barrier wallformed between each of the plurality of electro-wetting prisms.

The barrier wall may be formed of a black material for blocking light.

The 2D/3D switchable image display device may further comprise avariable diffuser unit that is switchable between a scattering mode forscattering passing light and a transparent mode for transmitting passinglight without scattering, wherein the control unit controls the variablediffuser unit to be in a transparent mode during a 3D mode and to be ina scattering mode during a 2D mode.

The variable diffuser unit may be a polymer dispersed liquid crystal(PDLC) panel.

The light modulation panel may be a liquid crystal panel.

The backlight unit may be a collimating surface light source emittingcollimated light in a first direction.

In another aspect, there is provided an electro-wetting prism arraycomprising a plurality of electro-wetting prisms arranged in atwo-dimensional (2D) array and including a plurality of red, green, andblue electro-wetting prisms that receive image information and , forproviding color to the image information that penetrates the pluralityof electro-wetting prisms, and a barrier wall located between eachelectro-wetting prism, wherein the electro wetting prism array iscapable of switching between a 2D mode in which image information passesthrough the electro-wetting prism array such that when viewed by a userboth a left and a right eye of a user see the same image, and a 3D modein which image information is directed by the electro-wetting prismarray to at least two different view zones such that when viewed by theuser the left eye sees a first image and the right eye sees a secondimage that has a different parallax than the first image.

Image information may be directed by the electro-wetting prism array inat least two different view zones such that when viewed by the user theleft eye and the right eye of the user experience a binocular disparity.

Image information may be directed by the electro-wetting prism array inat least two different view zones such that when viewed by the user theleft eye and the right eye of the user experience a stereoscopic effect.

In 3D mode the first image and the second image may be displayed at thesame time.

In 3D mode the first image and the second image may be displayedsequentially.

The electro-wetting prism array may be electrically connected to asensor to sense a user's position and gather data that is used by theelectro-wetting prism array to optimize a view zone of the user based onthe user's sensed position.

The barrier wall may function as a black matrix that reduces thegeneration of a black band effect and also prevents crosstalk betweenthe image information received by each of the plurality ofelectro-wetting prisms.

Other features and aspects may be apparent from the followingdescription, the drawings, and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an example of atwo-dimensional/three-dimensional (2D/3D) switchable image displaydevice.

FIG. 2 is a diagram illustrating an example of an electro-wetting prismarray that may be included in a 2D/3D switchable image display device.

FIG. 3 is a diagram illustrating an example of an electro-wetting prismof the electro-wetting prism array of FIG. 2.

FIG. 4 is a diagram illustrating an example of an electro-wetting prismin a first state.

FIG. 5 is a diagram illustrating an example of an electro-wetting prismin a second state.

FIG. 6 is a diagram illustrating an example of a 2D/3D switchable imagedisplay device in 3D mode.

FIG. 7 is a diagram illustrating an example of a 2D/3D switchable imagedisplay device in 2D mode.

Throughout the drawings and the description, unless otherwise described,the same drawing reference numerals should be understood to refer to thesame elements, features, and structures. The relative size and depictionof these elements may be exaggerated for clarity, illustration, andconvenience.

DESCRIPTION

The following description is provided to assist the reader in gaining acomprehensive understanding of the methods, apparatuses, and/or systemsdescribed herein. Accordingly, various changes, modifications, andequivalents of the methods, apparatuses, and/or systems described hereinmay be suggested to those of ordinary skill in the art. Also,descriptions of well-known functions and constructions may be omittedfor increased clarity and conciseness.

FIG. 1 illustrates an example of a two-dimensional(2D)/three-dimensional (3D) switchable image display device. Forexample, the image display device may be or may be included in a camera,a computer such as a laptop or personal computer, a television, a mobileterminal, and the like.

Referring to FIG. 1, the 2D/3D switchable image display device includesa backlight unit 100, a display panel 200, and a control unit 300controlling the backlight unit 100 and the display panel 200.

The backlight unit 100 is located at a rear side of the display panel200 and emits light towards the display panel 200. The backlight unit100 may be a well-known surface light source, for example, a liquidcrystal display (LCD), one or more light-emitting diodes (LEDs), one ormore organic light-emitting diodes (OLEDs), and the like. For example,the backlight unit 100 may include a light guide panel and a lightsource formed at a side of the light guide panel. The light source maybe a surface light source in which a point light source is arranged in a2D array. The backlight unit 100 may include a pattern for improving thedirectivity of light L and the pattern may be located adjacent to thelight output plane side. The backlight unit 100 may include an opticalfilm such as a prism sheet such that the backlight unit 100 may emitcollimated light in a direction that is approximately perpendicular tothe light output plane.

The display panel 200 may include, for example, a first substrate 210, aliquid crystal layer 220, a second substrate 230, an electro-wettingprism array 250, and a third substrate 270.

The first through third substrates 210, 230, and 270 support the liquidcrystal layer 220 and the electro-wetting prism array 250, and may beformed of a transparent material, for example, glass, plastic, and thelike. An electric circuit (not shown) may be formed in the first throughthird substrates 210, 230, and 270 and may be used to drive the liquidcrystal layer 220 and the electro-wetting prism array 250.

The liquid crystal layer 220 may include a plurality of liquid crystalcells 220 a arranged in a 2D array. The image gradation may be formed bymodulating the light L emitted from the backlight unit 100 based on theimage information. A transparent pixel electrode (not shown) and a pixelcircuit (not shown) may be formed on an upper surface of the firstsubstrate 210 and may be used to apply a voltage to the liquid crystallayer 220. A transparent common electrode (not shown) may be formed on alower surface of the second substrate 230.

The electro-wetting prism array 250 provides color to light beams thatpass through the liquid crystal cells 220 a of the liquid crystal layer220 and controls the direction of the light beams. The electro-wettingprism array 250 includes a plurality of red, green, and blueelectro-wetting prisms 250R, 250G, and 250B.

FIG. 2 illustrates an example of an electro-wetting prism array that maybe included in a 2D/3D switchable image display device. Referring toFIGS. 1 & 2, the electro-wetting prism array 250 includes the pluralityof red, green, and blue electro-wetting prisms 250R, 250G, and 250B thatare arranged in a 2D array. A barrier wall 259 may be formed between theplurality of red, green, and blue electro-wetting prisms 250R, 250G, and250B.

The electro-wetting prisms 250R, 250G and 250B may control the directionof a light beam L. Also, the electro-wetting prisms 250R, 250G, and 250Bmay function as a color filter. Accordingly, an additional color filterdoes not need to be formed on the display panel 200. Because a colorfilter is not used, the process of arranging upper and lower plates,which is required in the manufacturing of a conventional display panel,is omitted. Thus, the process of manufacturing an image display devicecan be simplified, thereby increasing production yield and reducing themanufacturing cost.

The barrier wall 259 may be formed of a black material in order to blocklight, and may function as a black matrix for preventing light passingthrough the adjacent red, green, and blue electro-wetting prisms 250R,250G, and 250B from being overlapped, thereby preventing crosstalk. In aconventional stereoscopic image display device using a perpendicularlenticular lens array, a black matrix formed on a display panel isenlarged by a lenticular lens, which results in generation of a blackband at certain viewing angles. Because the barrier wall 259 of theelectro-wetting prism array 250 functions as a black matrix, a blackband is not generated by the 2D/3D switchable image display devicedescribed herein.

FIG. 3 illustrates an example of an electro-wetting prism of theelectro-wetting prism array 250, for example, electro-wetting prisms250R, 250G, and 250B. Referring to the example shown in FIG. 3, each ofthe electro-wetting prisms 250R, 250G and 250B includes a housing 251and first and second mediums 257 and 258 in the housing 251.

The housing 251 may include a light incidence plane 255, a light outputplane 256 facing the light incidence plane 255, a plurality of sidewalls formed between the light incidence plane 255 and the light outputplane 256. For example, as illustrated in FIG. 3, the housing 251 mayhave a rectangular shape, a square shape, and the like. In this example,a first electrode 252L to which a first voltage V_(L) is applied and asecond electrode 252R to which a second voltage V_(R) is applied, may beformed in two side walls facing each other, from among the four sidewalls of the housing 251. The first electrode 252L and the secondelectrode 252R may be insulated by a first insulating layer 253L and asecond insulating layer 253R, respectively. The first electrode 252L andthe second electrode 252R may be coated with a first hydrophobic film254L and a second hydrophobic film 254R, respectively.

In the alternative, instead of coating the first hydrophobic film 254Land the second hydrophobic film 254R, the first insulating layer 253Land the second insulating layer 253R may be formed of a hydrophobicmaterial. A transparent electrode (not shown) may be formed in the lightoutput plane 256 and may be used to apply a voltage to the second medium258. The transparent electrode may be grounded. In this example, the2D/3D switchable image display device is driven by two electrodes,however, this is merely for purposes of example. It should be understoodthat additional electrodes may be formed in the side walls of thehousing 251 such that the 2D/3D switchable image display device isdriven by additional electrodes.

The first medium 257 and the second medium 258 may have differentrefractive indexes and electrical conductivities. For example, the firstmedium 257 may be an oily-type solution that contains colored dyes, andthe second medium 258 may be a transparent aqueous solution that is notmixed with the first medium 257. Alternatively, the first medium 257 maybe a transparent oily solution and the second medium 258 may be anaqueous solution containing color pigments.

Referring again to FIG. 1, the display panel 200 may include a variablediffuser unit 280 capable of improving a wide viewing angle property ofthe image display device in a 2D mode. For example, the variablediffuser unit 280 may be a well-known polymer dispersed liquid crystal(PDLC) panel. The PDLC panel has a structure that includes a PDLC layerformed by mixing a polymer dispersed-type liquid crystal and a black dyeand is interposed between transparent substrates.

When an electric field is not applied, the PDLC panel may be in ascattering mode in which incident light is scattered due to a dielectricconstant difference between the polymer and the liquid crystal. In thealternative, when an electric field is applied, a dielectric constantdifference between polymer and liquid crystal aligned according to theelectric field is reduced, and the PDLC panel becomes transparent.Accordingly, the PDLC may be in a transparent mode that transmits light.The variable diffuser unit 280 may be controlled by the control unit 300such that the variable diffuser unit 280 is in a transparent mode whendisplaying a 3D image and is in a scattering mode when displaying a 2Dimage.

Operations of the electro-wetting prisms 250R, 250G and 250B and the2D/3D switchable image display device are described with reference toFIGS. 4 and 5.

FIG. 4 illustrates an example of an electro-wetting prism in a firststate. When a voltage is applied to the first electrode 252L and thesecond electrode 252R using electro-wetting, the second medium 258,which is an aqueous solution, is wet to the first hydrophobic film 254Land the second hydrophobic film 254R. At this time, a first contactangle θ_(L) and a second contact angle θ_(R) may vary based on themagnitude of the applied voltage.

When the electro-wetting prisms 250R, 250G and 250B are in the firststate, an interface 257 a between the first medium 257 and the secondmedium 258 is approximately parallel to the light incidence plane 255.The same voltage, for example, a voltage of 6V may be applied to thefirst electrode 252L and the second electrode 252R such that both thefirst contact angle θ_(L) and the second contact angle θ_(R) areinclined at an angle of approximately 90 degrees.

FIG. 5 illustrates an example of an electro-wetting prism in a secondstate. When the electro-wetting prisms 250R, 250G and 250B are in thesecond state, the interface 257 a between the first medium 257 and thesecond medium 258 is inclined at a predetermined angle with respect tothe light incidence plane 255. Different voltages, for example, voltagesof 0V and 12V may be applied to the first electrode 252L and the secondelectrode 252R such that the first contact angle θ_(L) and the secondcontact angle θ_(R) are inclined at different angles.

For example, the first contact angle θ_(L) and the second contact angleθ_(R) may satisfy a relation of a supplementary angle. As the interface257 a is inclined, as illustrated in FIG. 3, incident light L that isapproximately perpendicular to the light incidence plane 255 isrefracted by an angle of δ in the interface 257 a with respect to aninitial direction. For example, the angle δ may vary according to thevoltage applied to the first electrode 252L and the second electrode252R.

FIG. 6 illustrates an example of a 2D/3D switchable image display devicein 3D mode.

Referring to FIGS. 1 and 6, the electro-wetting prism array 250 maychange the path of a light beam L modulated in the liquid crystal cells220 a of the liquid crystal layer 220 and may direct the light beam Linto at least two different view zones. For example, the control unit300 may control a refraction angle by applying a voltage to each of theelectro-wetting prisms 250R, 250G, and 250B such that the path of thelight beam L modulated in the liquid crystal cells of the liquid crystallayer 220 are directed and focused for each view zone.

For example, the liquid crystal cells 220L corresponding to the lightbeam L may be directed toward a left eye E_(L) to display an image for aleft eye, and the liquid crystal cells 220R corresponding to the lightbeam L may be directed toward a right eye E_(R) to display an image fora right eye. Accordingly, both the image for the left eye and the imagefor the right eye may be directed by the electro-wetting prism array 250and may have a binocular disparity. As a result, a user can experience astereoscopic effect. Meanwhile, the passing light beam L obtains a red,green, and/or blue color for each pixel, respectively, while passingthrough the electro-wetting prism array 250. That is, a complete rangeof color may be obtained by combining the individual pixels of red,green, and blue colors. The individual pixels may be combined bycombining the adjacent pixels formed on the display panel 200 or byforming images by the individual pixels of red, green, and blue colorsand overlapping the images on a user's image plane.

FIG. 6 illustrates an example in which light beams L are modulated inthe liquid crystal layer 220 and are directed into two view zones,however it should be appreciated that the image display device is notlimited thereto. For example, the electro-wetting prism array 250 maydirect the light beams L modulated in the liquid crystal layer 220 tothree or more view zones such that a plurality of users may observe thelight beam L or such that one user may observe the light beam L whilechanging the position.

In addition, FIG. 6 illustrates an example in which images havingdifferent parallaxes are displayed at the same time, however it shouldbe appreciated that the image display device is not limited thereto. Forexample, the liquid crystal layer 220 may sequentially display imagesthat have different parallaxes, and may display a 3D image using a timemultiplexing method used to control the electro-wetting prism array 250to transmit a light beam to a view zone corresponding to a parallax ofeach image. The time multiplexing method displays an image correspondingto one view zone using all the pixels of the liquid crystal layer 220,and thus resolution reduction in the 3D mode can be compensated for.

In some embodiments, when the variable diffuser unit 280 is employed,the control unit 300 may control the variable diffuser unit 280 tooperate in a transparent mode such that the passing light beam L is notscattered, thereby maintaining division of the view zone.

In some embodiments, when the 2D/3D switchable image display deviceincludes a sensor (not shown) for tracing a user's position, theelectro-wetting prism array 250 may be controlled to direct a view zoneoptimized for the user's position or to change division of the view zoneaccording to the change of the user's position.

Because a path of a light beam L is adjusted by the electro-wettingprisms 250R, 250G and 250B so as to direct a view zone in the 2D/3Dswitchable image display device, loss of light during the division ofthe view zone does not occur. As a result, brightness in a 3D mode isgreater than that of a conventional barrier-type stereoscopic imagedisplay device.

FIG. 7 illustrates an example of the 2D/3D switchable image displaydevice in a 2D mode.

Referring to FIGS. 1 and 7, the electro-wetting prism array 250 may notdivide a path of the light beam L modulated in the liquid crystal cells220 a of the liquid crystal layer 220 into different view zones. Forexample, as in the example described with reference to FIG. 4, thecontrol unit 300 may apply a voltage such that the interface 257 abetween the first medium 257 and the second medium 258 of each of theelectro-wetting prisms 250R, 250G and 250B are parallel to the lightincidence plane 255. Meanwhile, the liquid crystal layer 220 may displaygradation of an image with respect to a conventional 2D image. Thus, auser's left eye E_(L) and right eye E_(R) see the same conventional 2Dimage.

Furthermore, when the variable diffuser unit 280 is employed, thecontrol unit 300 may control the variable diffuser unit 280 to operatein a scattering mode such that the passing light beam L may be scatteredto ensure a wide viewing angle. Accordingly, the wide viewing angle maybe realized in a 2D mode, and the liquid crystal layer 220 may berealized in a twisted-nematic (TN) liquid crystal mode, which is lessexpensive, thereby reducing a manufacturing cost. Furthermore, the TNliquid crystal mode may suppress the decrease in an aperture ratiocompared to a mobile patterned vertical alignment (mPVA) liquid crystalmode, and may also increase a response time.

As described herein, the display panel 200 is a flat panel in which alight modulation panel including the liquid crystal layer 220 and theelectro-wetting prism array 250 are formed as one body, however, itshould be appreciated that the image display device is not limitedthereto. For example, the light modulation panel including the liquidcrystal layer 220 and the electro-wetting prism array 250 may be formedseparately and then coupled together.

The 2D/3D switchable image display device described herein has a wideviewing angle property having uniform light dispersion with respect tovarious viewing positions in a 2D mode, and may collect light in aspecific angle and adjust the angle in a 3D mode. Also, the 2D/3Dswitchable image display device may allow a 2D/3D switchable device tobe formed on a flat panel.

The methods, functions, processes, and the like, described above may berecorded, stored, or fixed in one or more computer-readable storagemedia that includes program instructions to be implemented by a computerto cause a processor to execute or perform the program instructions. Themedia may also include, alone or in combination with the programinstructions, data files, data structures, and the like. Examples ofcomputer-readable storage media include magnetic media, such as harddisks, floppy disks, and magnetic tape; optical media such as CD ROMdisks and DVDs; magneto-optical media, such as optical disks; andhardware devices that are specially configured to store and performprogram instructions, such as read-only memory (ROM), random accessmemory (RAM), flash memory, and the like. Examples of programinstructions include machine code, such as produced by a compiler, andfiles containing higher level code that may be executed by the computerusing an interpreter. The described hardware devices may be configuredto act as one or more software modules in order to perform theoperations and methods described above, or vice versa. In addition, acomputer-readable storage medium may be distributed among computersystems connected through a network and computer-readable codes orprogram instructions may be stored and executed in a decentralizedmanner.

As a non-exhaustive illustration only, the terminal device describedherein may refer to mobile devices such as a cellular phone, a personaldigital assistant (PDA), a digital camera, a portable game console, anMP3 player, a portable/personal multimedia player (PMP), a handhelde-book, a portable lab-top personal computer (PC), a global positioningsystem (GPS) navigation, and devices such as a desktop PC, a highdefinition television (HDTV), an optical disc player, a setup box, andthe like, capable of wireless communication or network communicationconsistent with that disclosed herein.

A computing system or a computer may include a microprocessor that iselectrically connected with a bus, a user interface, and a memorycontroller. It may further include a flash memory device. The flashmemory device may store N-bit data via the memory controller. The N-bitdata is processed or will be processed by the microprocessor and N maybe 1 or an integer greater than 1. Where the computing system orcomputer is a mobile apparatus, a battery may be additionally providedto supply operation voltage of the computing system or computer.

It should be apparent to those of ordinary skill in the art that thecomputing system or computer may further include an application chipset,a camera image processor (CIS), a mobile Dynamic Random Access Memory(DRAM), and the like. The memory controller and the flash memory devicemay constitute a solid state drive/disk (SSD) that uses a non-volatilememory to store data.

A number of examples have been described above. Nevertheless, it shouldbe understood that various modifications may be made. For example,suitable results may be achieved if the described techniques areperformed in a different order and/or if components in a describedsystem, architecture, device, or circuit are combined in a differentmanner and/or replaced or supplemented by other components or theirequivalents. Accordingly, other implementations are within the scope ofthe following claims.

1. A two-dimensional/three-dimensional (2D/3D) switchable image display device comprising: a backlight unit for emitting light; a light modulation panel for modulating the light emitted from the backlight unit based on image information and for forming image gradation; an electro-wetting prism array comprising a plurality of electro-wetting prisms that are arranged in correspondence to a plurality of pixels of the image, for providing color to light beams that penetrate the plurality of electro-wetting prisms, and for adjusting the direction of the light beams; and a control unit for controlling the electro-wetting prism array such that the light beams of the plurality of pixels of the image are directed towards at least two different view zones in a 3D mode, and such that the light beams of the plurality of pixels of the image maintain the paths of the light beams in a 2D mode.
 2. The 2D/3D switchable image display device of claim 1, wherein the electro-wetting prism comprises: a first medium having color; a transparent second medium separate from the first medium; a housing for housing the first medium and the second medium, and comprising a light incidence plane, a light output plane facing the light incidence plane, and a plurality of side walls formed between the light incidence plane and the light output plane; and an electrode structure for adjusting an angle of an interface between the first medium and the second medium.
 3. The 2D/3D switchable image display device of claim 1, wherein the control unit controls the electro-wetting prism array such that the interface between the first medium and the second medium is inclined to the light incidence plane in a 3D mode, and such that the interface between the first medium and the second medium is approximately parallel to the light incidence plane in a 2D mode.
 4. The 2D/3D switchable image display device of claim 2, wherein the electrode structure comprises: first and second electrodes that are formed in first and second side walls, respectively, and which face each other; and first and second insulating layers that cover the first and second electrodes, respectively, and which each have a hydrophobic surface.
 5. The 2D/3D switchable image display device of claim 2, wherein the first medium is an oily solution containing colored dyes and the second medium is an aqueous solution.
 6. The 2D/3D switchable image display device of claim 2, wherein the first medium is an aqueous solution containing colored pigments and the second medium is an oily solution.
 7. The 2D/3D switchable image display device of claim 2, wherein the electro-wetting prism array comprises: a red electro-wetting prism that has a red first medium; a green electro-wetting prism that has a green first medium; and a blue electro-wetting prism that has a blue first medium.
 8. The 2D/3D switchable image display device of claim 1, wherein the electro-wetting prism array further comprises a barrier wall formed between each of the plurality of electro-wetting prisms.
 9. The 2D/3D switchable image display device of claim 8, wherein the barrier wall is formed of a black material for blocking light.
 10. The 2D/3D switchable image display device of claim 1, further comprising a variable diffuser unit that is switchable between a scattering mode for scattering passing light and a transparent mode for transmitting passing light without scattering, wherein the control unit controls the variable diffuser unit to be in a transparent mode during a 3D mode and to be in a scattering mode during a 2D mode.
 11. The 2D/3D switchable image display device of claim 10, wherein the variable diffuser unit is a polymer dispersed liquid crystal (PDLC) panel.
 12. The 2D/3D switchable image display device of claim 1, wherein the light modulation panel is a liquid crystal panel.
 13. The 2D/3D switchable image display device of claim 1, wherein the backlight unit is a collimating surface light source emitting collimated light in a first direction.
 14. An electro-wetting prism array comprising: a plurality of electro-wetting prisms arranged in a two-dimensional (2D) array and including a plurality of red, green, and blue electro-wetting prisms that receive image information and , for providing color to the image information that penetrates the plurality of electro-wetting prisms; and a barrier wall located between each electro-wetting prism, wherein the electro wetting prism array is capable of switching between a 2D mode in which image information passes through the electro-wetting prism array such that when viewed by a user both a left and a right eye of a user see the same image, and a 3D mode in which image information is directed by the electro-wetting prism array to at least two different view zones such that when viewed by the user the left eye sees a first image and the right eye sees a second image that has a different parallax than the first image.
 15. The electro-wetting prism array of claim 14, wherein the image information is directed by the electro-wetting prism array in at least two different view zones such that when viewed by the user the left eye and the right eye of the user experience a binocular disparity.
 16. The electro-wetting prism array of claim 14, wherein the image information is directed by the electro-wetting prism array in at least two different view zones such that when viewed by the user the left eye and the right eye of the user experience a stereoscopic effect.
 17. The electro-wetting prism array of claim 14, wherein in 3D mode the first image and the second image are displayed at the same time.
 18. The electro-wetting prism array of claim 14, wherein in 3D mode the first image and the second image are displayed sequentially.
 19. The electro-wetting prism array of claim 14, wherein the electro-wetting prism array is electrically connected to a a sensor to sense a user's position and gather data that is used by the electro-wetting prism array to optimize a view zone of the user based on the user's sensed position.
 20. The electro-wetting prism array of claim 14, wherein the barrier wall functions as a black matrix that reduces the generation of a black band effect and also prevents crosstalk between the image information received by each of the plurality of electro-wetting prisms. 